Furnace construction.



W. A. WALKER, Sn. FURNACE CONSTRUCTION. APPLICATION Hum SEPT. 26,1907.

Patented De0.8,1908.'

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WILLIAM A. WALKER, SE, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOROF SEVEN- I I SIXTEENTHS TO FRANK JOHNSTON, OF BEN AVON, PENNSYLVANIA.

FURNACE CONSTRUCTION.

Specification of Letters Patent.

Patented Dec. 8, 1908.

Application filed September 26, 1907. Serial No. 394,598.

To all whom it may concern:

Be it known that I, WILLIAM A. WALKER, Sr., a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Furnace Oonstruction, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention refers to improvements in furnace construction, more particularly the furnace of a locomotive boiler, and it has for its object to provide means for supplying superheated steam to the fire box to assist combustion, fully consume the fuel or its byproducts, preventing smoke, and reducing the cost of operation.

In the drawings: Figure 1 is a longitudinal vertical section partly in elevation of a locomotive boiler, indicated by the line I. I. of Fig.2. Fig. 2 is a horizontal section indicated by the line II. II. of Fig. 1, the boiler tubes being partly broken away. Fig. 3 is a vertical cross section on the line III. III. of Fig. 1. Fig. 4 is an elevation of the rear end of the boiler. Fig. 5 is an enlarged sectional detail View showing one of the jet pipes and its connections.

The invention is designed to employ superheated steam taken from the steam drum or any other point Where dry steam may be insured, carried through a superheating coil located in the path of the hot gases, then conveyed backwardly along the boiler at each side and introduced into distributing pipes having jet nipples leading into the firebox at opposite sides, with means for controlling the supply.

In the drawings 2 represents the shell of the boiler provided with the usual fiues 3 extending from the smoke box 4 to the firebox 5 and connected with the front and back sheets 6 and 7 in the usual Way.

Dry steam is taken from the steam drum cavity 8 by pipe 9 to a box or header 10 located above the back end of the boiler from which leads a pipe 11 having a controlling valve 12 the stem of which is provided with a hand wheel 13 within easy reach of the engineer or fireman. The box 10 is preferably of broad fiat construction, laid closely against the outer fire box shell for good heating effect, and within easy reach. Pipe 11 leads forwardly along theshell of the boiler,

thereby remaining hot, and is connected at its forward end with a coil of pipe 14 located in the smoke box 4 and rigidly supported by any suitable frame or. bracket 15 connected with the front of the main steam supplypipe 16 or in any other suitable manner.

The coil of pipes 14 may be of any number desired and are preferably located at an incline immediately, in front of the ends of the flues 3 as shown, in which position the circulating contained steam vsdll be highly superheated. The last coil of pipes 14 is connected with branch pipes 17 at each side extending through the shell 2 from which extend backwardly and downwardly pipes 18 connected at their rear ends with supply pipes 19. Said supply pipes 19 are located along each side of the. firebox between the fire box shell 20 and outer shell 2 as shown, one of said pipes being about three inches above the other, and both being some distance above the grate bars.

Each pipe 19 is provided with jet pipes 21 secured in and extending through the fire box shell 20 in any suitable manner as by tightening nuts and acking gaskets to make a fluid-tight fit, and the jets are so located that the jets at one side are directed inwardly at p0 nts between or at one side of the jets of the other side. As above stated the rows of jets on opposite sides are on different levels, and by this arrangement the oppositely disposed inwardly directed jets de iver the superheated steam across the fire box without interference with each other, and at the same time transverse the entire area of the fire. box. By this arrangement the partly consumed gases or fuel of combustion and all cinders, smoke etc. pass upwardly to the fines through the zone of superheated steam. Intense heat of combustion is thereby produced resultingin burning up all of the carbon of the fuel and completely consuming every part.

The invention is particularly ada ted to furnaces fired with green fuel, asin ocomotive practice. It prevents the escape of smoke, requires but a small part of the steam, and results in a great saving of coal.

The device may be adapted to other types of furnaces and may be changed or varied by the skilled mechanic in different features or details, and I do not desire to be limited to the construction shown and described.

What I claim is:

1. In a locomotive boiler provided with a steam drum, the combination with the fire box having fuel sup orting grates and outer and inner shells, oheaders provided with jets extending inwardly through the inner fire box wall into the fire chamber above the grates, a su erheating coil located in front of the boiler ues in the path of the gases of combustion of the furnace having distributing pi es connected at each side of the fire box wit said headers, a steam box located above the outer shell of the fire box chamber, a pipe leading from the interior of the steam drum to said box, and a ipe leading from said box along the boiler s iell to the su erheating coil provided with a control ing valve and an operating device therefor, substantially as set forth.

2. In a locomotive boiler provided with a steam drum, the combination with the fire box having grates and outerand inner shells, of headers located between the said shells of the fire box provided with jets extending inwardly through the inner fire box Walls into the fire chamber above the grates and arranged out of alinement with each other, a superheating coil located in front of the boller fines in the path of the gases of combustion of the furnace having distributing pipes connected at each side of the fire box with said headers, a steam box located above the outer shell of the fire box chamber, a pipe leading from the interior of the steam drum to said box, and a pipe leading from said box along the boiler shell to the su erheating coil provided with a controlling va ve and an operating device therefor, substantially as set forth.

3. In a locomotive boiler provided with a steam drum, the combination with the fire box having fuel supporting grates, of headers provided with ets extending inwardly through the fire box walls into the fire chamber above the grates, a superheating coil consisting of a series of slopingly arranged horizontal tubes located in the path of the gases of combustion of the furnace in front of the boiler fines, the upper tube of said coil having oppositely disposed distributing pipes connected with said headers at each side, and a conductor leading from the steam drum of the locomotive to said superheating coil, and embodying a steam box located above the fire box and a controlling valve and operating device therefor, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM A. WALKER, SR.

Witnesses:

C. M." CLARKE, CHAS. S. LEPLEY. 

